I haven't had any problems all day - but I've heard endless complaints about ICQ crashing.
Trillian = AOL, ICQ, MSN and YAHOO in one (for those who don't know)
http://www.download.com/Trillian/300...=dl&tag=button
Trillian Basic is free, has no ads and uses up a lot less of your computer's resources, comparred to even one of the other standalone programs. I sound like I work for them!